下载图片部分有错误,不能全部下载
import json
import re
import requests
from requests.exceptions import RequestException
#定义抓取一个页面代码
def get_one_page(url):
headers={
'User-Agent':'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/47.0.2526.108 Safari/537.36 2345Explorer/8.7.0.16013'
}
#定义异常
try:
response=requests.get(url,headers=headers)
#根据状态码判断是否抓取成功
if response.status_code==200:
return response.text
return None
except RequestException:
return None
#解析网页
def parse_one_page(html):
#每次要加起始符和结束符
pattern=re.compile('<dd>.*?board-index.*?">(\d+)</i>.*?data-src="(.*?)".*?</a>.*?name"><a.*?>(.*?)</a>'
+'.*?star">(.*?)</p>.*?releasetime">(.*?)</p>'
+'.*?integer">(.*?)</i>.*?fraction">(.*?)</i>.*?</dd>',re.S)
items=re.findall(pattern,html)
for item in items:
yield {
'index':item[0],
'image':item[1],
'title':item[2],
#切片,去掉'主演:'
'actor':item[3].strip()[3:],
'time':item[4].strip()[5:],
'score':item[5]+item[6]
}
#写入文件
def write_to_file(content):
#加encoding显示中文,写入方式为'a',否则只能写一条
with open('result.txt','a',encoding='utf-8') as f:
f.write(json.dumps(content,ensure_ascii=False)+'\n')
f.close()
#根据图片链接下载图片
def download(image_url, pathname):
headers = {
'User-Agent': 'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/47.0.2526.108 Safari/537.36 2345Explorer/8.7.0.16013'
}
response = requests.get(image_url, headers=headers)
with open(pathname, 'ab') as f:
f.write(response.content) #二进制文件
f.close()
#定义main方法调用
#根据网页结构加入参数offset,获得下一页内容
def main(offset):
#把offset作为参数传入url
url="http://maoyan.com/board/4?offset="+str(offset)
html=get_one_page(url)
count=0 #下载的图片计数
for item in parse_one_page(html):
print(item)
#把爬取的内容写入txt文件
write_to_file(item)
#下载图片到文件夹
pathname = "D:\\spider\\image\\" + str(count + 1) + ".jpg"
download(item['image'], pathname)
count = count + 1
if __name__=='__main__':
#读取10页前100个电影,构造0-90的循环
for i in range(10):
main(i*10)